SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ce9dd040f74a470463f0cbd94f112241c89d4c2312755e039b902848f0d2c191' 
  AND token = 'ZhwFa9y+YB3VQtYHjaoqMC2qWSzZkhndZsBNW6axtCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}